Patna

Whether it's best or not depends on a lot of questions, The course you want to pursue, the fees you are willing to give, you are looking for placements after college or further studies, which specific college you are looking at, and a lot others.

There's many universities which are better than Patliputra Univeristy such as NIT patna when it comes to many courses, one being Engineering among others. But then they charge a bit higher fees than Patliputra University in some courses, There's also faculty difference, The alumnis of each college, and whatnot which makes everyUniversity good at some things, and not so good at others. So you have to pick as per your needs.

Hoping this helps.